81640640

素因数分解:

$2^6\times 5^1\times {\mathrm{255127}}^1$

素因数の和:255144

約数の個数: 28

約数和(自身を含む): 194407536

約数和(自身を除く): 112766896

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 255127, 510254, 1020508, 1275635, 2041016, 2551270, 4082032, 5102540, 8164064, 10205080, 16328128, 20410160, 40820320, 81640640]

約数ペア:

[(1, 81640640), (2, 40820320), (4, 20410160), (5, 16328128), (8, 10205080), (10, 8164064), (16, 5102540), (20, 4082032), (32, 2551270), (40, 2041016), (64, 1275635), (80, 1020508), (160, 510254), (320, 255127)]